Tap chuck



June H2, E923. l fg@ M. N. JARvls TAP ,CHUCK Filed May 14. 1921 INVENTOR.

A TTORNEY.

Patented .lune l2, 1923.

nutren ica.

MRSHALL N. iAPvvs, 0F GLDERSLEEVE, CONNECTICUT.'

To @ZZ whom t may concern.'

Be it known that l, MARSHALL N. Janvrs, a citizen ot the United IStates,residing at Gildersleeve, in the county ot Middlesex and State ofConnecticut, have invented certain new and useful lmprovements in tap'requisite strength to resist properly the va-` rious demands put uponit.

In the drawings accompanying and tormy ing part of the presentspecification, l have shown in detail one-oi1 the several advantageousforms of embodiment of the invention which will be set forth fully inthe following description. Obviously l am not limited to-thisdisclosure. I may depart therefrom in a number of respects within thescope of the invention defined by the claims following said description.

Referring to said drawings:

Figure 1 is an outside elevation of a tap chuck involving the inventionand with thek spindle held in thehousing for causing this spindle torevolve in one direction.

Fig. 2 is a view practically similar to Fig. 1 with a portion brokenaway and in section.

Fig. 3 is a view somewhat similar to Fig. 2, but with the spindleadvanced and thus free to turn successively in opposite directions.

Fig. 4 is a section through the upper part of the body of the tap chuck.

Like characters reifer to like parts throughout the several views.

It will be understood that a tap chuck comprises mechanism tor rotatingthe toolholding spindle thereof in opposite directions, a conditionwhich is necessary when tapping a hole. ln other words when the tapenters the hole to be tapped, it will be rotated in the directionnecessary to cut the threads, the spindle being automatically rotated inthe opposite direction when thehole is tapped to cause the tap to be fedout of the tapped holes. It will be understood that this automaticreversal is due to the movement longitudinally of the spindle.

In the drawings l have shown a tap chuck involving mechanism by whichthe advanfrar CHUCK. f

Application filed liay 14, .1921. Serial No. 469,542.

tage pointed out is insured but which also permits the insertion orremoval oi' a tap without the necessity oit' stopping the spindle of themachine and by this result the same device can be advantageouslyemployed in drilling and such uses whereit is not necessary to reverseautomatically or otherwise 'the direction oi turning movement ov thespindle.

ln the accompanying drawings a chuck as `2 comprises a housing 3 whichencases the necessary gearing tor causing the projecting spindle t torotate successively yin opposite directions. rlhe gearing mentioned isin itself not new with me but on the contrary is quite old and common inthe art. Projecting from the rear ot the spindle l and entering thehousing is the shaft or extension 5, said housing 3 containing thenecessary reversing mechanism. Extending from within the housing 3 isthe taper shank 6 from which the gearing' and spindle obtain theirpower. Rigidly attached to the housing 3 but loosely encircling thelower portion of shank 6, is the dog or arm 7, which supports loy someclamping means, in either vertical or horizontal relation. the. arm 7furnished with the rod 8.' rllhe drawings show the rod in the verticalrelation but by inserting it in the hole 9 the horizontal relation isobtained, the object ot this rod, which is common practice, being tokeep certain mechanism within the housing 3 from turning and being longenough to encounter some stationary part of the machine on which the`chuck is being used.

The housing 3 comprises a main or body portion 10 and a sleeve 11integral therewith and which is loosely encircled by the ring 12, heldin vertical adjusted relation with the sleeve 11 as by the annulargrooves 13 and 14; which alternately receive the balls 15 slidably heldin radial holes 16; in the ring 12, and held alternately in contact withthe walls of the grooves 113 or 14C by the springs 17, the inner ends ofthe springs bearing directly against the balls 15 and the opposite endsagainst the screws 18 threaded into the ring 12. At the outer end of thesleeve 11 are slidaloly inserted in holes the radial plugs or pins 19which at certain times enter the annular groove 20 in the shank 5 of thespindle Ll.

lt can be readily seen (Figs. 2 and 3) that the ring 12 has twopositions caused by the balls 15 being brought alternately l in Fig. 2andzligr. 3.

21 which, as will be noted, is 1wrought out of f and into engagementwith thepins `19 by the raising" and lowering of the ring` 12 as InFigs. 1-and2 itlwillfbe noted'that the spindle is pushed into thehousing for oausing the spindle to always run in one direction; saidlspindle being positively held in ,this relation bythe pins 19 enteringthe rroove'20off the spindle. Thevpins" 19 are held from coming,1 out ofengagement with the groove rby the annular surface'of the inside of thering 12 which will not permit the Voutward movement of, `the pins 19.l/Vhen the chuck'parts are in'this 'relation r fit is suitable for4cfr-operating with either a drill or reanier or any tool where onedirection vof rotationis required.` y In 3 ituwill be noted the chuck isadapted for a tap chuck, i. e., thespindle4 sity of stopping the machinef Q There are also features on they spindle 4 which I` have referred tobefore in this may freely move into or out of' the housing withoutinterference to tion of the spindle. n

Since the arm. 7 andpin or rod y8, asl

have-beforeexplained holdsthe housing 3` from rotary movement, 'itwill-,beseen'that the.y ring 12 is alsor non-rotary. v.l'.`herei"o're,

is obvious that'thering 12may he moved in eitherof its'positions Withoutthe neceseiect opposite rota,

specification which l permit the removal or insertion of'a tool withoutstopping the machine, `but as it is no part of this invention `l haveomitted any description of same.

' In Fig. 4 ofthe drawings, 'I have shown the housing' 3 which' carriesthe spindle 5 Vupon which isa gear 2O in mesh with the `gear 21 which iscarried upon the stub shaft 22 which carries the gear 23 in mesh1 withthe ,Qjear 24.

The gearing; shown in Fig'. 4 is essentially the same and operates inthe ysame manner as that shown in the patent to Durrenber- Number1,010,743, granted Dec'. 5, 1921.l `W/hat I claim isf l p A tap chuckcomprising ahousing` toy con-'` tain driving` mechanism and furnishedwith a rigid projecting sleeve, a spindle opera tively associated withthe housing, extending' lthrough the lsleeve and longitudinally-radjustable therethrough, a` ring surrounding' the sleeve andadvanceable and retracable thereon into'two positions, yieldin'gly urgedballs on Vthe ring, y y arately grooved to receive the balls when thering'. is in one of its twopositions and the sleeve being` septhus holdthe same'in an adjusted position,

radially slidahle pins in the sleeve, the' ring havinga groove toreceive the outer'ends of the -pins 'when the spindle is in itsbaCkposition,v and a. groove onl the spindle to receive theinner ends ofthepins when ythe yspindle is inpsaidzback` position.

In testimony ywhereof I affix my signature,v

Mausi-iam, N. ninv'i'sy Witnesses: l Y 'l l l QOLIvnR H. CLARK, l lFRANK C. BARKEn,

